<template>
  <div class="component-upload-image">
    <el-upload multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
      ref="imageUploadRef" :before-remove="handleDelete" :show-file-list="true" :headers="headers" :file-list="fileList"
      :on-preview="handlePictureCardPreview" :class="{ hide: fileList.length >= limit }" :data="queryData">
      <el-icon class="avatar-uploader-icon">
        <plus />
      </el-icon>
    </el-upload>
    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script setup lang="ts">
import { listByIds } from "@/api/system/oss";
import { delStationAttachment } from "@/api/station/index";
import { propTypes } from '@/utils/propTypes';
import { globalHeaders } from "@/utils/request";

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: propTypes.number.def(10),
  // 大小限制(MB)
  fileSize: propTypes.number.def(5),
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: propTypes.array.def(["png", "jpg", "jpeg"]),
  // 大小限制(MB)
  uploadUrl: propTypes.string.def('/biz-station/station/attachment/upload'),
  queryData: propTypes.object.def({}),
});

const { proxy } = getCurrentInstance() as ComponentInternalInstance;
const emit = defineEmits(['update:modelValue']);
const number = ref(0);
const uploadList = ref<any[]>([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(baseUrl + props.uploadUrl); // 上传的图片服务器地址
const headers = ref(globalHeaders());

const fileList = ref<any[]>([]);
const imageUploadRef = ref<ElUploadInstance>();

watch(() => props.modelValue, async val => {
  if (val) {
    // 首先将值转为数组
    let list: any[] = [];
    if (Array.isArray(val)) {
      list = val;
    }
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      // 字符串回显处理 如果此处存的是url可直接回显 如果存的是id需要调用接口查出来
      let itemData;
      if (typeof item === "string") {
        itemData = { name: item, url: item };
      } else {
        // 此处name使用ossId 防止删除出现重名
        itemData = { ...item, name: item.id, url: item.ossId };
      }
      return itemData;
    });
  } else {
    fileList.value = [];
    return [];
  }
}, { deep: true, immediate: true });

/** 上传前loading加载 */
const handleBeforeUpload = (file: any) => {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some((type: any) => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy?.$modal.msgError(
      `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
    );
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy?.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy?.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
const handleExceed = () => {
  proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
const handleUploadSuccess = (res: any, file: UploadFile) => {
  if (res.code === 200) {
    uploadList.value.push({ ...res.data, name: res.data.name, url: res.data.ossId });
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy?.$modal.closeLoading();
    proxy?.$modal.msgError(res.msg);
    imageUploadRef.value?.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除图片
const handleDelete = async (file: UploadFile): boolean => {
  const findex = fileList.value.map(f => f.name).indexOf(file.name);
  if (findex > -1 && uploadList.value.length === number.value) {
    let ossId = fileList.value[findex].id;
    let res = await delStationAttachment([ossId]);
    if (res.code == 200) {
      fileList.value.splice(findex, 1);
      emit("update:modelValue", fileList.value);
      return false;
    } else {
      return true;
    }

  }
  return true;
}

// 上传结束处理
const uploadedSuccessfully = () => {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
    uploadList.value = [];
    console.log(fileList.value)
    number.value = 0;
    emit("update:modelValue", fileList.value);
    proxy?.$modal.closeLoading();
  }
}

// 上传失败
const handleUploadError = () => {
  proxy?.$modal.msgError("上传图片失败");
  proxy?.$modal.closeLoading();
}

// 预览
const handlePictureCardPreview = (file: any) => {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
}

// 对象转成指定字符串分隔
const listToString = (list: any[], separator?: string) => {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].ossId && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].ossId + separator;
    }
  }
  return strs != "" ? strs.substring(0, strs.length - 1) : "";
}
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>
